• Journal of The Korean Association For Science Education
• /
• v.15 no.1
• /
• pp.126-131
• /
• 1995

The purpose of this study was to identify how young children conceptualize living things and nonliving things. For this study, a total of 465 young children was sampled in Krea, and a questionnaire of paper test was administered to them. The results were as follows. 1. More than 80% of young children recognized dogs and dandelions as living things, but less than 60% of children recognized bird's eggs and chestnuts as living things. 2. Mostly, young children's ability to distinguish exactly between living things and nonliving things improved by increasing grade level. 3. Criteria to distinguish about living things and nonliving things are firstly to be mobilized and secondly to be breathed.

• Korean Journal of Ichthyology
• /
• v.34 no.3
• /
• pp.172-178
• /
• 2022

To investigate the feeding habits and trophic level of the blackthroat seaperch, Doederleinia berycoides in the South Sea of Korea, fish samples were collected by a bottom trawl net from fisheries resources survey vessels of NIFS in February, May, August and November 2021. The total length (TL) of these specimens was from 3.3 to 33.1 cm. D. berycoides fed majorly on Teleostei (especially Engraulis japonicus) based on index of relative importance (%IRI=64.4%). D. berycoides underwent an ontogenetic dietary shift. Smaller individuals (<10.0 cm TL) fed mainly on amphipods. The proportion of amphipods decreased as body size increased, whereas the consumption of Teleostei increased gradually. Examination of the feeding habits according to ontogentic feeding patterns in the diets of D. berycoides revealed that the mean weight of prey (mW/ST) continuously increased, while mean number of prey (mN/ST) decreased and then increased. The estimated average trophic level of the D. berycoides was 3.62±0.64, ranging from 3.31±0.52 to 3.79±0.70.

• Journal of Plant Biotechnology
• /
• v.45 no.4
• /
• pp.364-368
• /
• 2018

The R2R3-type protein IbMYB1 transcription factor is a key regulator for anthocyanin biosynthesis in the storage roots of sweet potatoes. It was previously demonstrated that the IbMYB1 expression stimulates anthocyanin pigmentation in tobacco leaves, arabidopsis and storage roots of sweet potatoes. In this study, we generated the transgenic potato plants that express the IbMYB1 genes, which accumulated high levels of anthocyanins under the control of either the tuber-specific patatin (PAT) promoter or oxidative stress-inducible peroxidase anionic 2 (SWPA2) promoter. The PAT-MYB1 transgenic lines exhibited higher anthocyanin levels in the tuber than the empty vector control (EV) or SWPA2-MYB1 plants. When combined, our results indicated that overexpression of the IbMYB1 is a highly promising strategy for the generation of transgenic plants with enhanced tissue specific anthocyanin production.

• Journal of Plant Biotechnology
• /
• v.48 no.2
• /
• pp.71-76
• /
• 2021

Angelica is a perennial plant used widely for medicinal purposes. Information on the genetic diversity of Angelica populations is important for their conservation and germplasm utilization. Although Angelica is an important medicinal plant genus registered in South Korea, no molecular markers are currently available to distinguish individual species from other similar species in different countries, in particular, China and Japan. In this study, we developed single nucleotide polymorphism (SNP) markers derived from internal transcribed spacer regions of the nuclear ribosomal DNA to identify a distinct domestic species, Angelica gigas Nakai, via a high-resolution melting (HRM) curve analyses. We also performed HRM curve analysis of intentionally mixed genomic DNA samples from five Angelica species. Finally, we investigated A. gigas Nakai and A. sinensis using varying ratios of mixed genomic DNA templates. The SNP markers developed in this study are useful for rapidly identifying A. gigas species from different countries.

• Journal of Life Science
• /
• v.12 no.6
• /
• pp.796-802
• /
• 2002

The purpose of this study was to determine changes in their insluin and leptin in 30 obese girls' high school students, 26kg/$m^2$ or over in BMI after the aerobic exercise and obese education program over 8 weeks and then those changes 8 weeks after the program. Those 30 obese students were divided into four groups, aerobir exercise and obese education(8), aerobic exercise(8), obese education(8) and control group(6). Aerobic exercise was applied in the form of jogging for 8 weeks, 4 times a week and 50 minutes a time and with the exercise strength of 65 to 75% HRmax. Obese education was provided 60 minutes per week over the same weeks. The results of the study can be described as follows. 1) For the level of insulin, aerobic exercise and obese education, and aerobic exercise groups showed a more significant decrease after the programs were completed than either before they were applied or 8 weeks after they were halted(p＜.05). 2) In terms of the level of leptin, aerobic exercise and obese education, and aerobic groups accomplished a more significant lowering after the programs were completed than either before they were started or 8 weeks after they were stopped(p＜.05).

• Journal of agriculture & life science
• /
• v.43 no.6
• /
• pp.45-52
• /
• 2009

The purpose of this study is to verify the effect of raising plants at home on elementary school students' emotional intelligence. The experimental group in the post-test showed significant differences in all the domains of emotional perception, emotional expression, emotional empathy, emotional control, emotional application, compared to the control group, which indicated that the activity of raising plants at home has positive effects on the emotional intelligence of high graders in elementary school. Even in the change of students' emotional intelligence according to their gender, male students in the experimental group had higher average values more than the control group, showing significant differences in all the domains of emotional perception, emotional expression, emotional empathy, emotional control, emotional application. Female students in the experimental group had the same tendency. Accordingly, as a result of this study, it was found that the activity of raising plants at home has positive effects on the improvement of elementary school high graders' emotional intelligence.

• Journal of The Korean Association For Science Education
• /
• v.34 no.6
• /
• pp.549-558
• /
• 2014

Integrated concepts that are broad enough to embrace facts, principles, laws, and concepts of multiple disciplines could become the core of integrated education. Integrated concept-centered education enables effective and practical learning. In this study, the Delphi Method was implemented targeting experts in science (physics, life science, chemistry, and earth science) and humanities (history, geology, economics, ethics, and politics) to find out the integrated concept that can be used to design the concept-centered integrated education in the Republic of Korea. 124 experts participated in this survey. Delphi survey was conducted for three rounds. In the first round, an open questionnaire was given to experts to collect feasible integrated concepts in each major field. Then, in the second round experts were asked to select integrated concepts that could be used practically in the field of their major. In the third round, the integrated concept with selection frequency over medium value were given. They were asked to evaluate the applicability of integrated concepts by using the Likert-scale questionnaire. Through this process, content validity was analyzed. As a result, five integrated concepts (change, interaction, space-time, energy, and equilibrium) were selected for the inter-science integration. And thirteen integrated concepts (conflict, community, relationship, structure, power, diversity, culture, change, society, interaction, freedom, justice, and equality) were chosen for the inter-humanities integration. Finally, for the science-humanities integration, seven integrated concepts (structure, diversity, change, interaction, cycle, system, and environment) were determined.

• Journal of The Korean Association For Science Education
• /
• v.22 no.1
• /
• pp.76-92
• /
• 2002

OECD/PISA(Programme for International Student Assessment) is significant in that it is the first international comparative study assessing 15-year-old students' scientific literacy. Based on Korean students' results of percent correct in 35 science items, several characteristics such as followings were revealed. First, from the perspectives of science application area, Korean students showed the highest achievement in the area of 'science in technology' followed by in the areas of 'science in life and health' and 'science in earth and environment'. Male students achieved significantly better than female counterparts in all three areas. Second, the achievement in items of science knowledge was significantly higher than in items of scientific processes. Whereas the achievement difference between science knowledge- and scientific process items was larger for male students. Third, from the perspectives of application contexts, Korean students showed the highest achievement in the historical context and the lowest achievement in the personal context. Fourth, from the perspectives of item format, Korean students performed significantly better in open-constructed items rather than in multiple-choice items. Fifth, Korean students showed low performance in items of biotechnology and environment-related issue, which was more prominent for female students. Sixth, whereas male students performed significantly better than female students in most aspects, it is noteworthy that there was no significant gender differences in items of scientific processes and females performed significantly better than male students in open-constructed items which require long sentence.

• Journal of The Korean Association For Science Education
• /
• v.35 no.5
• /
• pp.805-815
• /
• 2015

The Korean education curriculum is making efforts to improve education to foster competencies that the future society demands through the 2007 and 2009 revised curriculum. The revised curricula focus on enhanced articulation for the quality curriculum. In this study, the curriculum is analyzed for vertical and horizontal articulation. In addition, the study found a problem in Korea's curriculum through international comparison and sought improvement. Furthermore, the study compared internationally articulation of the concept of photosynthesis, of which the results are as follows. First, our science curriculum focuses on vertical articulation and has relatively neglected the problem of horizontal articulation. To compensate for this problem, curriculum design should introduce aspects of 'nature' and 'environment' and should consider the interests and concerns of students, as countries with high horizontal articulation do. Second, the actual education field has a problem with the a lack of continuity and sequence because of concentration of concept in a specific grade or simply repeating the concept across multiple grades. These results have led to alternative proposals that should arrange basis of concept configuration such as 'Big Idea' and should establish the adoption of 'systems' frequently appearing in the other curricula. Finally, there may be mentioned a lack of research on students' learning progression, which can be a common standard of horizontal and vertical articulation. Research on learning progression has been a trend overseas, but there exists no study to fit Korea's situation, so education fields need to conduct the appropriate research on learning progression as part of the commitment to high-quality curriculum.

• Journal of Science Education
• /
• v.33 no.2
• /
• pp.336-345
• /
• 2009

The purpose of this study is to analysis ERF components patterns of causal questions generated during the observation of biological phenomenon. First, the system that shows pictures causing causal questions based on biological phenomenon (evoked picture system) was developed in a way of cognitive psychology. The ERF patterns of causal questions based on time-series brain processing was observed using MEG. The evoked picture system was developed by R&D method consisting of scientific education experts and researchers. Tasks were classified into animal (A), microbe (M), and plant (P) tasks according to biological species and into interaction (I), all (A), and part (P) based on the interaction between different species. According to the collaboration with MEG team in the hospital of Seoul National University, the paradigm of MEG task was developed. MEG data about the generation of scientific questions in 5 female graduate student were collected. For examining the unique characteristic of causal question, MEG ERF components were analyzed. As a result, total 100 pictures were produced by evoked picture and 4 ERF components, M1(100~130ms), M2(220~280ms), M3(320~390ms), M4(460~520ms). The present study could guide personalized teaching-learning method through the application and development of scientific question learning program.